1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * arch/alpha/lib/csum_ipv6_magic.S 4 * Contributed by Richard Henderson <rth@tamu.edu> 5 * 6 * unsigned short csum_ipv6_magic(struct in6_addr *saddr, 7 * struct in6_addr *daddr, 8 * __u32 len, 9 * unsigned short proto, 10 * unsigned int csum); 11 * 12 * Misalignment handling (which costs 16 instructions / 8 cycles) 13 * added by Ivan Kokshaysky <ink@jurassic.park.msu.ru> 14 */ 15 16 #include <linux/export.h> 17 .globl csum_ipv6_magic 18 .align 4 19 .ent csum_ipv6_magic 20 .frame $30,0,$26,0 21 csum_ipv6_magic: 22 .prologue 0 23 24 ldq_u $0,0($16) # e0 : load src & dst addr words 25 zapnot $20,15,$20 # .. e1 : zero extend incoming csum 26 extqh $18,1,$4 # e0 : byte swap len & proto while we wait 27 ldq_u $21,7($16) # .. e1 : handle misalignment 28 29 extbl $18,1,$5 # e0 : 30 ldq_u $1,8($16) # .. e1 : 31 extbl $18,2,$6 # e0 : 32 ldq_u $22,15($16) # .. e1 : 33 34 extbl $18,3,$18 # e0 : 35 ldq_u $2,0($17) # .. e1 : 36 sra $4,32,$4 # e0 : 37 ldq_u $23,7($17) # .. e1 : 38 39 extql $0,$16,$0 # e0 : 40 ldq_u $3,8($17) # .. e1 : 41 extqh $21,$16,$21 # e0 : 42 ldq_u $24,15($17) # .. e1 : 43 44 sll $5,16,$5 # e0 : 45 or $0,$21,$0 # .. e1 : 1st src word complete 46 extql $1,$16,$1 # e0 : 47 addq $20,$0,$20 # .. e1 : begin summing the words 48 49 extqh $22,$16,$22 # e0 : 50 cmpult $20,$0,$0 # .. e1 : 51 sll $6,8,$6 # e0 : 52 or $1,$22,$1 # .. e1 : 2nd src word complete 53 54 extql $2,$17,$2 # e0 : 55 or $4,$18,$18 # .. e1 : 56 extqh $23,$17,$23 # e0 : 57 or $5,$6,$5 # .. e1 : 58 59 extql $3,$17,$3 # e0 : 60 or $2,$23,$2 # .. e1 : 1st dst word complete 61 extqh $24,$17,$24 # e0 : 62 or $18,$5,$18 # .. e1 : len complete 63 64 extwh $19,7,$7 # e0 : 65 or $3,$24,$3 # .. e1 : 2nd dst word complete 66 extbl $19,1,$19 # e0 : 67 addq $20,$1,$20 # .. e1 : 68 69 or $19,$7,$19 # e0 : 70 cmpult $20,$1,$1 # .. e1 : 71 sll $19,48,$19 # e0 : 72 nop # .. e0 : 73 74 sra $19,32,$19 # e0 : proto complete 75 addq $20,$2,$20 # .. e1 : 76 cmpult $20,$2,$2 # e0 : 77 addq $20,$3,$20 # .. e1 : 78 79 cmpult $20,$3,$3 # e0 : 80 addq $20,$18,$20 # .. e1 : 81 cmpult $20,$18,$18 # e0 : 82 addq $20,$19,$20 # .. e1 : 83 84 cmpult $20,$19,$19 # e0 : 85 addq $0,$1,$0 # .. e1 : merge the carries back into the csum 86 addq $2,$3,$2 # e0 : 87 addq $18,$19,$18 # .. e1 : 88 89 addq $0,$2,$0 # e0 : 90 addq $20,$18,$20 # .. e1 : 91 addq $0,$20,$0 # e0 : 92 unop # : 93 94 extwl $0,2,$2 # e0 : begin folding the 64-bit value 95 zapnot $0,3,$3 # .. e1 : 96 extwl $0,4,$1 # e0 : 97 addq $2,$3,$3 # .. e1 : 98 99 extwl $0,6,$0 # e0 : 100 addq $3,$1,$3 # .. e1 : 101 addq $0,$3,$0 # e0 : 102 unop # : 103 104 extwl $0,2,$1 # e0 : fold 18-bit value 105 zapnot $0,3,$0 # .. e1 : 106 addq $0,$1,$0 # e0 : 107 unop # : 108 109 extwl $0,2,$1 # e0 : fold 17-bit value 110 zapnot $0,3,$0 # .. e1 : 111 addq $0,$1,$0 # e0 : 112 not $0,$0 # .. e1 : and complement. 113 114 zapnot $0,3,$0 # e0 : 115 ret # .. e1 : 116 117 .end csum_ipv6_magic 118 EXPORT_SYMBOL(csum_ipv6_magic)
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